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  <title>Set grouping criteria</title>
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  <h1 class="refname">CollectionFind::groupBy</h1>
  <p class="verinfo">(No version information available, might only be in Git)</p><p class="refpurpose"><span class="refname">CollectionFind::groupBy</span> &mdash; <span class="dc-title">Set grouping criteria</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-mysql-xdevapi-collectionfind.groupby-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>mysql_xdevapi\CollectionFind::groupBy</strong></span>(<span class="methodparam"><span class="type">string</span> <code class="parameter">$sort_expr</code></span>): <span class="type"><a href="class.mysql-xdevapi-collectionfind.html" class="type mysql_xdevapi\CollectionFind">mysql_xdevapi\CollectionFind</a></span></div>

  <p class="para rdfs-comment">
   This function can be used to group the result-set by one more columns, frequently this is used with
   aggregate functions like COUNT,MAX,MIN,SUM etc.
  </p>

 </div>


 <div class="refsect1 parameters" id="refsect1-mysql-xdevapi-collectionfind.groupby-parameters">
  <h3 class="title">参数</h3>
  <dl>
   
    <dt>
<code class="parameter">sort_expr</code></dt>

    <dd>

     <p class="para">
      The columns or columns that have to be used for the group operation, this can either be a single string
      or an array of string arguments, one for each column.
     </p>
    </dd>

   
  </dl>

 </div>


 <div class="refsect1 returnvalues" id="refsect1-mysql-xdevapi-collectionfind.groupby-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   A CollectionFind that can be used for further processing
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-mysql-xdevapi-collectionfind.groupby-examples">
  <h3 class="title">范例</h3>
  <div class="example" id="example-1578">
   <p><strong>示例 #1 <span class="function"><strong>mysql_xdevapi\CollectionFind::groupBy()</strong></span> example</strong></p>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br /></span><span style="color: #FF8000">//Assuming&nbsp;$coll&nbsp;is&nbsp;a&nbsp;valid&nbsp;Collection&nbsp;object<br /><br />//Extract&nbsp;all&nbsp;the&nbsp;documents&nbsp;from&nbsp;the&nbsp;Collection&nbsp;and&nbsp;group&nbsp;the&nbsp;results&nbsp;by&nbsp;the&nbsp;'name'&nbsp;field<br /></span><span style="color: #0000BB">$res&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$coll</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">find</span><span style="color: #007700">()-&gt;</span><span style="color: #0000BB">groupBy</span><span style="color: #007700">(</span><span style="color: #DD0000">'name'</span><span style="color: #007700">)-&gt;</span><span style="color: #0000BB">execute</span><span style="color: #007700">();<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
   </div>

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